From 5c7677e5fa134b60c7d4c29d3643125901a31fb8 Mon Sep 17 00:00:00 2001
From: Tom Smeding <tom.smeding@gmail.com>
Date: Sun, 13 Sep 2020 17:58:51 +0200
Subject: WIP rust client

---
 rust/.gitignore   |   3 +
 rust/Cargo.toml   |  13 ++
 rust/src/error.rs |  27 +++
 rust/src/main.rs  | 483 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 526 insertions(+)
 create mode 100644 rust/.gitignore
 create mode 100644 rust/Cargo.toml
 create mode 100644 rust/src/error.rs
 create mode 100644 rust/src/main.rs

(limited to 'rust')

diff --git a/rust/.gitignore b/rust/.gitignore
new file mode 100644
index 0000000..671fbc4
--- /dev/null
+++ b/rust/.gitignore
@@ -0,0 +1,3 @@
+target/
+Cargo.lock
+debug.txt
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
new file mode 100644
index 0000000..2c95d3c
--- /dev/null
+++ b/rust/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "tomsg-rustclient"
+version = "0.1.0"
+authors = ["Tom Smeding <tom.smeding@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+tomsg-rs = { git = "https://github.com/lieuwex/tomsg-rs" }
+termion = "1.5"
+tokio = { version = "0.2", features = ["rt-threaded"] }
+futures = "0.3"
+once_cell = "1.4"
+unicode-width = "^0.1.8"
diff --git a/rust/src/error.rs b/rust/src/error.rs
new file mode 100644
index 0000000..f25bc5d
--- /dev/null
+++ b/rust/src/error.rs
@@ -0,0 +1,27 @@
+use std::io;
+
+pub trait IntoIOError {
+    fn ioerr(self) -> io::Error;
+    fn perror(self, parent: io::Error) -> io::Error;
+}
+
+// This impl bound is taken directly from the io::Error::new function.
+impl<E: Into<Box<dyn std::error::Error + Send + Sync>>> IntoIOError for E {
+    fn ioerr(self) -> io::Error {
+        io::Error::new(io::ErrorKind::Other, self)
+    }
+
+    fn perror(self, parent: io::Error) -> io::Error {
+        io::Error::new(parent.kind(), format!("{}: {}", self.into(), parent))
+    }
+}
+
+pub trait IntoIOResult<T> {
+    fn iores(self) -> io::Result<T>;
+}
+
+impl<T, E: IntoIOError> IntoIOResult<T> for Result<T, E> {
+    fn iores(self) -> io::Result<T> {
+        self.map_err(|e| e.ioerr())
+    }
+}
diff --git a/rust/src/main.rs b/rust/src/main.rs
new file mode 100644
index 0000000..2d08656
--- /dev/null
+++ b/rust/src/main.rs
@@ -0,0 +1,483 @@
+use std::fs::{File, OpenOptions};
+use std::collections::{HashMap, HashSet};
+use std::io::{self, Write};
+use std::sync::{Arc, Mutex};
+use std::convert::TryFrom;
+use futures::channel::mpsc;
+use futures::stream::StreamExt;
+use once_cell::sync::Lazy;
+use tokio::{runtime, task};
+use tokio::sync::Mutex as AsyncMutex;
+use termion::{clear, color, cursor};
+use termion::event::Key;
+use termion::raw::{IntoRawMode, RawTerminal};
+use termion::input::{TermRead, MouseTerminal};
+use termion::screen::AlternateScreen;
+use tomsg_rs::Connection;
+use tomsg_rs::connection;
+use tomsg_rs::PushMessage;
+use tomsg_rs::Command;
+use tomsg_rs::Word;
+use tomsg_rs::Line;
+use tomsg_rs::Reply;
+use tomsg_rs::Message;
+use tomsg_rs::Id;
+use unicode_width::UnicodeWidthChar;
+
+mod error;
+
+static DEBUG_FILE: Lazy<Mutex<File>> = Lazy::new(|| {
+    Mutex::new(
+        OpenOptions::new().write(true).truncate(true).create(true)
+            .open("debug.txt").unwrap())
+});
+
+fn debug_write(s: &str) {
+    writeln!(DEBUG_FILE.lock().unwrap(), "{}", s).unwrap();
+}
+
+macro_rules! debug {
+    ($($args:expr),*) => {
+        debug_write(&format!($($args),*));
+    }
+}
+
+fn draw_hori_bar<W: Write>(mut w: W, y: u16, x1: u16, x2: u16) -> io::Result<()> {
+    for x in x1..x2 {
+        write!(w, "{}─", cursor::Goto(x + 1, y + 1))?;
+    }
+    Ok(())
+}
+
+fn draw_vert_bar<W: Write>(mut w: W, x: u16, y1: u16, y2: u16) -> io::Result<()> {
+    for y in y1..y2 {
+        write!(w, "{}│", cursor::Goto(x + 1, y + 1))?;
+    }
+    Ok(())
+}
+
+fn wrap_text(s: &str, maxwid: u16) -> Vec<String> {
+    let mut iter = s.chars();
+    let mut lines = Vec::new();
+    let mut nextline = String::new();
+    let mut cursor = 0;
+    loop {
+        let c = match iter.next() {
+            Some(c) => c,
+            None => break,
+        };
+        if let Some(wid) = c.width().map(|w| u16::try_from(w).unwrap()) {
+            if cursor + wid > maxwid {
+                lines.push(nextline);
+                nextline = String::new();
+                cursor = 0;
+            }
+            nextline.push(c);
+            cursor += wid;
+        }
+    }
+    if nextline.len() > 0 {
+        lines.push(nextline);
+    }
+    lines
+}
+
+type Stdout = MouseTerminal<AlternateScreen<RawTerminal<io::Stdout>>>;
+
+#[derive(Debug, Copy, Clone)]
+struct Layout {
+    rlsepx: u16,  // x-coordinate of room list / chat log separator bar
+    nlsepx: u16,  // x-coordinate of chat log / nick list separator bar
+}
+
+impl Default for Layout {
+    fn default() -> Self {
+        Self { rlsepx: 5, nlsepx: 5 }
+    }
+}
+
+impl Layout {
+    fn compute(size: (u16, u16), state: &State) -> Self {
+        let rlsepx = u16::try_from(state.roomlist.iter().map(|s| s.as_str().len()).max().unwrap_or(5)).unwrap();
+        let room = state.rooms.get(&state.currentroom);
+        let maxnicklen = room.map(|r| r.members.iter().map(|s| s.as_str().len()).max().unwrap_or(5)).unwrap_or(5);
+        let nlsepx = size.0 - u16::min(size.0, u16::try_from(maxnicklen).unwrap() + 1);
+        Self { rlsepx, nlsepx }
+    }
+}
+
+struct App {
+    conn: Connection,
+    state: AsyncMutex<State>,
+}
+
+struct State {
+    stdout: Stdout,
+    termsize: (u16, u16),
+    layout: Layout,
+    roomlist: Vec<Word>,
+    rooms: HashMap<Word, RoomData>,
+    currentroom: Word,
+    msgs: HashMap<Id, Message>,
+}
+
+#[derive(Debug, Default)]
+struct RoomData {
+    members: Vec<Word>,
+    history: Vec<HItem>,
+    maxnicklen: usize,
+}
+
+#[derive(Debug)]
+enum HItem {
+    Message(Id),
+    Service(String),
+}
+
+impl App {
+    fn new(conn: Connection, stdout: Stdout) -> Self {
+        let termsize = (0, 0);
+        let state = State {
+            stdout,
+            termsize,
+            layout: Layout::default(),
+            roomlist: Vec::new(),
+            rooms: HashMap::new(),
+            currentroom: Word::try_from(String::new()).unwrap(),
+            msgs: HashMap::new(),
+        };
+        App {
+            conn,
+            state: AsyncMutex::new(state)
+        }
+    }
+
+    async fn fetch_rooms_list(self: &Arc<Self>) -> io::Result<()> {
+        debug!("fetch_rooms_list");
+        if let Ok(Reply::List(rooms)) = self.conn.send_command(Command::ListRooms).await? {
+            debug!("fetched room list: {:?}", rooms);
+            let newrooms = rooms.iter().collect::<HashSet<_>>();
+
+            {
+                let mut state = self.state.lock().await;
+                let toremove =
+                        state.roomlist.iter()
+                                      .filter(|r| !newrooms.contains(r))
+                                      .cloned()
+                                      .collect::<HashSet<_>>();
+                state.roomlist.retain(|r| !toremove.contains(r));
+                state.rooms.retain(|r, _| !toremove.contains(r));
+            }
+
+            self.full_redraw().await?;
+
+            for room in &rooms {
+                self.enter_room(room).await?;
+            }
+        }
+        Ok(())
+    }
+
+    async fn enter_room(self: &Arc<Self>, room: &Word) -> io::Result<()> {
+        debug!("enter_room({})", room);
+
+        {
+            let mut state = self.state.lock().await;
+            if state.rooms.insert(room.clone(), RoomData::default()).is_none() {
+                state.roomlist.push(room.clone());
+
+                if state.currentroom.as_str().len() == 0 {
+                    state.currentroom = room.clone();
+                }
+            }
+        }
+
+        self.full_redraw().await?;
+
+        let app = self.clone();
+        let room2 = room.clone();
+        task::spawn(async move {
+            if let Ok(Reply::List(members)) =
+                    app.conn.send_command(Command::ListMembers { room_name: room2.clone() })
+                        .await.unwrap() {
+                app.put_members(&room2, members).await.unwrap();
+            }
+        });
+        let app = self.clone();
+        let room2 = room.clone();
+        task::spawn(async move {
+            if let Ok(Reply::History(hist)) =
+                    app.conn.send_command(Command::History { room_name: room2.clone(), count: 20 })
+                        .await.unwrap() {
+                app.put_history(&room2, hist).await.unwrap();
+            }
+        });
+
+        Ok(())
+    }
+
+    async fn put_members(self: &Arc<Self>, room: &Word, ms: Vec<Word>) -> io::Result<()> {
+        debug!("put_members {} #{}", room, ms.len());
+        let mut state = self.state.lock().await;
+        state.rooms.get_mut(room).unwrap().members = ms;
+        state.full_redraw()
+    }
+
+    async fn add_member(self: &Arc<Self>, room: &Word, user: Word) -> io::Result<()> {
+        debug!("add_member {} {}", room, user);
+        let mut state = self.state.lock().await;
+        state.rooms.get_mut(room).unwrap().members.push(user);
+        state.full_redraw()
+    }
+
+    async fn put_history(self: &Arc<Self>, room: &Word, hist: Vec<Message>) -> io::Result<()> {
+        debug!("put_history {} #{}", room, hist.len());
+        let mut state = self.state.lock().await;
+        let ids = hist.iter().map(|m| m.id).collect::<Vec<_>>();
+        let replies = hist.iter().filter_map(|m| m.reply_on).collect::<Vec<_>>();
+
+        for msg in hist {
+            state.put_message(msg)?;
+        }
+
+        for replyid in replies {
+            if state.msgs.get(&replyid).is_none() {
+                let app = self.clone();
+                task::spawn(async move {
+                    if let Ok(Reply::Message(msg2)) =
+                            app.conn.send_command(Command::GetMessage(replyid)).await.unwrap() {
+                        app.state.lock().await.put_message(msg2).unwrap();
+                    }
+                });
+            }
+        }
+
+        for id in ids {
+            state.append_history(room, HItem::Message(id))?;
+        }
+
+        Ok(())
+    }
+
+    async fn append_history_item(self: &Arc<Self>, room: &Word, item: HItem) -> io::Result<()> {
+        let mut state = self.state.lock().await;
+        state.append_history(room, item)
+    }
+
+    async fn add_message(self: &Arc<Self>, msg: Message) -> io::Result<()> {
+        debug!("add_message {{id={} room={} user={}}}", msg.id, msg.roomname, msg.username);
+        let mut state = self.state.lock().await;
+
+        let roomname = msg.roomname.clone();
+        let msgid = msg.id;
+        let replyid = msg.reply_on;
+        state.put_message(msg)?;
+
+        if let Some(replyid) = replyid {
+            if state.msgs.get(&replyid).is_none() {
+                let app = self.clone();
+                task::spawn(async move {
+                    if let Ok(Reply::Message(msg2)) =
+                            app.conn.send_command(Command::GetMessage(replyid)).await.unwrap() {
+                        app.state.lock().await.put_message(msg2).unwrap();
+                    }
+                });
+            }
+        }
+
+        state.append_history(&roomname, HItem::Message(msgid))?;
+
+        Ok(())
+
+    }
+
+    async fn on_push(self: &Arc<Self>, pm: PushMessage) {
+        match pm {
+            PushMessage::Invite { room_name: room, inviter: _ } => {
+                self.enter_room(&room).await.unwrap();
+            }
+            PushMessage::Join { room_name: room, user } => {
+                self.add_member(&room, user.clone()).await.unwrap();
+                self.append_history_item(&room, HItem::Service(format!("Join: <{}>", user))).await.unwrap();
+            }
+            PushMessage::Message(msg) => {
+                self.add_message(msg).await.unwrap();
+            }
+            PushMessage::Online{ sessions: _, user: _ } => {}
+        }
+    }
+
+    async fn switch_buffer(self: &Arc<Self>, delta: isize) -> io::Result<()> {
+        {
+            let mut state = self.state.lock().await;
+            let current_index =
+                    state.roomlist.iter().enumerate()
+                                  .filter(|&t| *t.1 == state.currentroom)
+                                  .map(|t| t.0)
+                                  .next().unwrap_or(0);
+            let index = (current_index as isize + delta)
+                            .max(0).min(state.roomlist.len() as isize - 1);
+            state.currentroom = state.roomlist[index as usize].clone();
+        }
+        self.full_redraw().await
+    }
+
+    // Returns whether application should quit
+    async fn on_key(self: &Arc<Self>, key: Key) -> bool {
+        match key {
+            Key::Ctrl('c') => { return true; }
+            Key::Ctrl('l') => self.full_redraw().await.unwrap(),
+            Key::F(5) => self.switch_buffer(-1).await.unwrap(),
+            Key::F(6) => self.switch_buffer(1).await.unwrap(),
+            _ => debug!("{:?}", key)
+        }
+        false
+    }
+
+    async fn full_redraw(self: &Arc<Self>) -> io::Result<()> {
+        self.state.lock().await.full_redraw()
+    }
+}
+
+impl State {
+    fn full_redraw(&mut self) -> io::Result<()> {
+        self.termsize = termion::terminal_size()?;
+        self.layout = Layout::compute(self.termsize, &self);
+        print!("{}", clear::All);
+        draw_vert_bar(&mut self.stdout, self.layout.rlsepx, 0, self.termsize.1)?;
+        draw_vert_bar(&mut self.stdout, self.layout.nlsepx, 0, self.termsize.1 - 2)?;
+        draw_hori_bar(&mut self.stdout, self.termsize.1 - 2, self.layout.rlsepx + 1, self.termsize.0)?;
+
+        for (i, room) in self.roomlist.iter().enumerate() {
+            print!("{}", cursor::Goto(1, u16::try_from(i).unwrap() + 1));
+            if room == &self.currentroom {
+                print!("{}{}{}", color::Bg(color::Blue), room, color::Bg(color::Reset));
+            } else {
+                print!("{}", room);
+            }
+        }
+
+        if self.currentroom.as_str().len() > 0 {
+            let data = self.rooms.get(&self.currentroom).unwrap();
+
+            for (i, user) in data.members.iter().enumerate() {
+                print!("{}", cursor::Goto(self.layout.nlsepx + 2, u16::try_from(i).unwrap() + 1));
+                print!("{}", user);
+            }
+
+            let nicksepx = self.layout.rlsepx + u16::try_from(data.maxnicklen).unwrap() + 2;
+
+            draw_vert_bar(&mut self.stdout, nicksepx, 0, self.termsize.1 - 2)?;
+
+            let wid = self.layout.nlsepx - nicksepx - 2;
+            let mut y = self.termsize.1 - 3;
+            for item in data.history.iter().rev() {
+                let (prefix, text_to_format) = match item {
+                    HItem::Message(id) => {
+                        let msg = self.msgs.get(&id).unwrap();
+                        (format!("<{}>", msg.username), msg.message.as_str())
+                    }
+
+                    HItem::Service(msg) => {
+                        (String::from("--"), msg.as_str())
+                    }
+                };
+
+                let lines = wrap_text(text_to_format, wid);
+                let mut done = false;
+                for (i, line) in lines.iter().enumerate().rev() {
+                    if i == 0 {
+                        print!("{}{}", cursor::Goto(self.layout.rlsepx + 2, y + 1), prefix);
+                    }
+                    print!("{}{}", cursor::Goto(nicksepx + 3, y + 1), line);
+                    if y == 0 { done = true; break; }
+                    y -= 1;
+                }
+                if done { break; }
+            }
+        }
+
+        print!("{}", cursor::Goto(self.layout.rlsepx + 2, self.termsize.1));
+
+        self.stdout.flush()
+    }
+
+    fn put_message(&mut self, msg: Message) -> io::Result<()> {
+        self.msgs.insert(msg.id, msg);
+        Ok(())
+    }
+
+    fn append_history(&mut self, room: &Word, item: HItem) -> io::Result<()> {
+        let mut data = self.rooms.get_mut(room).unwrap();
+        match &item {
+            HItem::Message(id) => {
+                let msg = self.msgs.get(&id).unwrap();
+                data.maxnicklen = data.maxnicklen.max(msg.username.as_str().len() + 2);
+            }
+            HItem::Service(_) => {
+                data.maxnicklen = data.maxnicklen.max(2);
+            }
+        }
+        self.rooms.get_mut(room).unwrap().history.push(item);
+        self.full_redraw()
+    }
+}
+
+async fn pushchan_thread(mut chan: mpsc::Receiver<PushMessage>, app: Arc<App>) {
+    loop {
+        match chan.next().await {
+            None => break,
+            Some(pm) => app.on_push(pm).await,
+        }
+    }
+}
+
+async fn async_main() -> io::Result<()> {
+    let addr = ("127.0.0.1", 29538);
+    let (conn, pushchan) = Connection::connect(connection::Type::Plain, addr).await?;
+
+    let user = Word::try_from(String::from("tom")).unwrap();
+    let pass = Line::try_from(String::from("kaas")).unwrap();
+
+    match conn.send_command(Command::Register { username: user.clone(), password: pass.clone() }).await? {
+        Ok(Reply::Ok) => {},
+        _ => {},
+    }
+
+    match conn.send_command(Command::Login { username: user, password: pass }).await? {
+        Ok(Reply::Ok) => {},
+        _ => {
+            eprintln!("Failed to login!");
+            return Ok(());
+        },
+    }
+
+    debug!("initializing");
+
+    let stdout = io::stdout().into_raw_mode()?;
+    let stdout = AlternateScreen::from(stdout);
+    let stdout = MouseTerminal::from(stdout);
+
+    let app = Arc::new(App::new(conn, stdout));
+
+    task::spawn(pushchan_thread(pushchan, app.clone()));
+
+    app.full_redraw().await?;
+
+    let app_clone = app.clone();
+    task::spawn(async move {
+        app_clone.fetch_rooms_list().await.unwrap();
+    });
+
+    for key in io::stdin().keys() {
+        if app.on_key(key?).await {
+            break;
+        }
+    }
+
+    Ok(())
+}
+
+fn main() -> io::Result<()> {
+    runtime::Runtime::new()?.block_on(async_main())
+}
-- 
cgit v1.2.3-70-g09d2